It seems like every summer it happens, once it’s warm enough to swim, authorities are warning people to stay out of the water. Why? An abundance of one of the simplest living things on earth: algae. Actually a specific type of algae called cyanobacteria, tiny microorganisms that can cause serious illness.
Keith Bouma-Gregson is an environmental scientist with the California State Water Resources Control Board. He also co-leads the Fresh Water Harmful Algae Bloom Program, and has been tracking blooms in California.